∏型梁桥一般只用于( )的小跨径桥梁。
A．6～12 m
B．7.5～20 m
C．20～40 m
D．16～20 m
参考答案：A
- did you go on your holiday?
-I went to Tianjin. [ ]
A. What
B. How
C. Where
什么是物资的需求计划和采购计划？
